A bystander who watched the entire scene all the time decided to help me. He was an older man, around seventy, but nonetheless he went to the oldest of these kids and slapped him. The boy was sixteen.Sometimes this is an outcome of personal problems or incidents. For example, there could be a crime commited by someone of a certain origin. The consequence could be that the victims would blame an entire community.The reason for doing an excursion to Macau was that we had to catch a flight back to Thailand. Air Asia offered a ticket for 50$, while the same flight from Hong Kong would be over 200$.